added comments explaining logic for changes in PR#1327
added comments explaining logic for changes in PR#1327

bhargavvader/gensim,robotcator/gensim,RaRe-Technologies/gensim,quole/gensim,markroxor/gensim,piskvorky/gensim,ELind77/gensim,mattilyra/gensim,RaRe-Technologies/gensim,summanlp/gensim,quole/gensim,bhargavvader/gensim,summanlp/gensim,quole/gensim,macks22/gensim,RaRe-Technologies/gensim,mattilyra/gensim,summanlp/gensim,markroxor/gensim,gojomo/gensim,robotcator/gensim,mattilyra/gensim,gojomo/gensim,ELind77/gensim,ELind77/gensim,bhargavvader/gensim,RaRe-Technologies/gensim,gojomo/gensim,robotcator/gensim,piskvorky/gensim,macks22/gensim,markroxor/gensim,gojomo/gensim,macks22/gensim,piskvorky/gensim